Bought this truck new in 2003 presently have 140k on it, I opted for the high performance engine and my gas mileage is a little rough avg 12mpg city 16 high way
besides and annoying problem with a vacuum switch for the front differential which is located on the transfer case ( it was trying to engage the four wheel drive when you didn't push the button made a really nasty noise while the front tried to engage when the transfer was lined up) Other than that on regular scheduled maintenance has been done to this truck just a nice comfy ride due to the torsion bar suspension (something it's replacement doesn't have the Colorado) and the truck has not once broken down. Good performance , good handling( unless you have to turn around in a narrow street) car like ride yet will haul and run like a little sports car. Was a shame when they discontinued it they finally got it right.
Highly versatile truck does everything well. Just reached 50,000 miles with only a few cosmetic problems. Motor does a good job. Peppy, but no speed demon. Driver/front passenger in comfortable well laid out interior. Back seat room for children/ short trips only. 4.3L V-6 good torque/hp but geared for low-speed power & economy. Wide turning radius can be a problem in tight areas. Doesn't like quick turns either. Having bought the vehicle in one of it's later years of production. I expected to have less fit & finish problems already worked out. Slightly disappointed with that. Still this highly versatile vehicle just "Gets'er done.
Bought truck basically for light duty and travel to/from work. Has 77000 easy miles on it. Thus far, have gone thru 2 complete sets of tires, blown headgaskets twice, thermostat twice, water pump once, brakes twice. GM installed DEX-COOL may be eating engine gaskets; dealer is "unaware" of any DEX-COOL problems. I now have thick dark sludge in radiator overflow tank and in top of radiator. GM service mgr suggests I try to manually draw off sludge, clean out tank, and see if that helps, if not a thorough flush will have to be done. Fun to drive factor quickly failing.